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From: Logan Gunthorpe <logang@deltatee.com>
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Date: Wed, 5 Dec 2018 16:23:42 -0700
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Subject: Re: [RFC PATCH 02/14] mm/hms: heterogenenous memory system (HMS)
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To: Jerome Glisse <jglisse@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>, Andi Kleen <ak@linux.intel.com>, Linux MM <linux-mm@kvack.org>, Andrew Morton <akpm@linux-foundation.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Dave Hansen <dave.hansen@intel.com>, Haggai Eran <haggaie@mellanox.com>, balbirs@au1.ibm.com, "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, "Kuehling, Felix" <felix.kuehling@amd.com>, Philip.Yang@amd.com, "Koenig, Christian" <christian.koenig@amd.com>, "Blinzer, Paul" <Paul.Blinzer@amd.com>, John Hubbard <jhubbard@nvidia.com>, rcampbell@nvidia.com



On 2018-12-05 4:20 p.m., Jerome Glisse wrote:
> And my proposal is under /sys/bus and have symlink to all existing
> device it agregate in there.

That's so not the point. Use the existing buses don't invent some
virtual tree. I don't know how many times I have to say this or in how
many ways. I'm not responding anymore.

> So you agree with my proposal ? A sysfs directory in which all the
> bus and how they are connected to each other and what is connected
> to each of them (device, CPU, memory).

I'm fine with the motivation. What I'm arguing against is the
implementation and the fact you have to create a whole grand new
userspace API and hierarchy to accomplish it.

Logan